Your pool's volume in gallons is length × width × average depth × 7.48 — and it is the number every single dose depends on. Measure once, keep it.
≈ 17,235 gallons
65,242 liters. Average depth is (shallow + deep) ÷ 2.
This calculator gives you today's number. The app remembers your pool.
Every dose you will ever calculate starts from this number. Poolably saves your pool's volume and history, builds the full treatment plan in the right order, and reminds you when to retest — free on iPhone.
Get Poolably freeMeasure inside wall to inside wall at the waterline, in feet. For depth, use the water depth, not the wall height. If your pool has a long shallow shelf or tanning ledge, treat it as its own rectangle and add the two volumes — the calculator's average-depth assumption expects a steady slope.
Once you have the number, chlorine dosing is next: the chlorine calculator turns volume plus your CYA level into an exact dose. For why CYA changes your chlorine target, see the CYA-chlorine relationship and the full water chemistry guide.